CB-7102 - Initial implementation of globalization plugin in Firefox OS

Partial. No currency and number functions
I think we can support more formats assuming what is [defined here](http://pubs.opengroup.org/onlinepubs/007908799/xsh/strftime.html) is supported. Got the link from [a comment in l10n_date.js file](https://github.com/zalun/cordova-plugin-globalization/blob/ffos-initial/src/firefoxos/l10n_date.js#L34).

Long time and date is looking good, I'm getting: `Wed Oct 29 2014 5:00:00 PM`. Long time and short date are fine too. But long date gives me a short date and short time gives me long time.